What led directly to the separatist movements in eastern Europe in the1900s?

Separatist movements in Eastern Europe during the 1900s were primarily driven by nationalist sentiments, ethnic tensions, and the decline of empires, particularly the Austro-Hungarian and Ottoman Empires. The rise of nationalism encouraged various ethnic groups to seek autonomy or independence, aiming to establish nation-states reflecting their distinct identities. Additionally, socio-economic inequalities and political repression fueled discontent, leading to demands for self-determination and the eventual push for separation from larger political entities. Events like World War I further destabilized the region, providing opportunities for these movements to gain momentum.